code: def test_can_use_cub_oversize_input2(self):
      # full reduction with array size = 64 GB should work!
      mem = memory.alloc(100)
      a = cupy.ndarray(
          (2**6 * 1024**3,), dtype=cupy.int8, memptr=mem
      )
      b = cupy.empty((), dtype=cupy.int8)
      assert self.can_use([a], [b], (0,), ()) is not None
  
imports: from itertools import combinations
  import unittest
  import sys
  import cupy
  from cupy import _environment
  from cupy import testing
  from cupy._core import _accelerator
  from cupy._core import _cub_reduction
  from cupy.cuda import memory
label_desc: Use image node_id 6 for calling the TestSimpleCubReductionKernelMisc obj's underlying member method code with example usage: obj.test_can_use_cub_oversize_input2() without return types